Manufacture of artificial products from viscose



Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE;

mine? VAN mi WANT Am) MAn'rmus PETRUS ANTONIUS BOUMAN, or ABNHEM,

NETHERLANDS, KUNSTZIJDEFAIBRIEK,

ASSIGNORS T0 NAAMLOOZE OF ARNHEM, NETHERLANDS.

VENNOOTSCHAP NEDEBLANDSCHE MANUFACTURE OF ARTIFICIAL PRODUCTS FROM USCG SE.

No Drawing. Application file ufacture of artificial products from viscose,- ribbons, straw and the like,

such as fibres,

contain a salt in addition to an acid, usually sulphuric acid; for example,

phate, magnesium sodium sulsulphate and ammonium sulphate are salts which have been proposed for this purpose.

Our present invention is based on the discovery that salts (other than zinc) referred to in ana monium sulphide bivalent metals of the bivalent metals of the group commonly lytical work as the amgroup, that is to say, of other than zinc) whose sulphides are not precipitated in presence of an acid, have cipitating bath on cellulose hydrate a specific influence in the pre- By our present invent-ion the acid precipitating bath in the manufacture of artificial roducts from viscose contains a salt of such a metal, with or without theaddition of another salt or salts or other additions, such as glucose, commonly used in the process.

The artificial products obtained by our invention have a very stuffs, and can therefore great aflinity for dyebe dycd'in deep shades; also, owing to an equalizing action which the salts in question exert on the fibre, dyeings produced on the artificial products obtained tion are more even. that the salts of t according to our inven- We have further found he bivalent metals, other than zinc, whose sulphide is not precipitated in presence of an acid and whose atomic weight lies between 57 and 60, and preferably between 58,5

and 59,2, such as nickel and cobalt, are best suitable for the purpose we have in View.

Even a small quantity of the salt is suflficient for obtaining the desired effect, the effect being roughly proportional to the quantity of the added metal salt in the bath. A bath containing one per cent of nickel sulphate produces a very good effect. The

nickel sulphate need not be'wadded to the bath as such, but

may be formed in the d March 4, 1926, Serial No. 92,364, and in Germany March 5, 1925.

bath by the addition of another suitable nickel salt.

As a preferred embodiment of our invention the following example of a spinning bath is given; it must be understood, howthat our invention is in no way limited according to our invention have proved to. I be very suitable for carrying out our invention.

10 parts by weight of sulphuric acid.

8 parts by weight of sodium sulphate.

16 parts by weight of magnesium sulphate.

1 part by weight of nickel sulphate.

Instead of nickel sulphate, other nickel compounds may be used and also for instance cobalt nitrate; although the vaddition of a zincsalt to the precipitating bath does not form per se a part ofour invention, a zinc salt may be present in the bath in addition to the nickel or other metallic salt used according to our invention.

Ve claim:

1. A process of manufacturing artificial products from viscose consisting in precipitating the viscose solution in a spinning bath containing in addition to the usual spinning bath constituents at least one salt of a bivalent metal the atomic weight of which lies between 57 and 60 and whose sulphide is not precipitated in presence of an sulphide is not precipitated in presence of.

an acid.

In testimony whereof we afl'ix our signature.

DARCY VAN DER WANT. M. P. A; BOUMAN. 

